Nude swimming at

I grew up in a very conservative and closed family and community. I had never been skinny dipping. Nevertheless, after graduating from high tutor, one very hot, overwhelming August weekend night, I and one of my friends were at our another friend’s dwelling – complete with secluded outdoor swimming pool. By the way, his relatives were out of state, and his sister was away at tutor (or so we thought).
After having dead several beers a piece, we determined it would be a good angle to enjoy the pool. Since we had no swim suits, it was rational to simply remove our clothes and jump in. After splashing around for quite some time, we heard female voices.
Suddenly, the one friend’s sister comes out

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